LXR linux/arch/parisc/include/asm/processor.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * include/asm-parisc/processor.h
   4 *
   5 * Copyright (C) 1994 Linus Torvalds
   6 * Copyright (C) 2001 Grant Grundler
   7 */
   8
   9#ifndef __ASM_PARISC_PROCESSOR_H
  10#define __ASM_PARISC_PROCESSOR_H
  11
  12#ifndef __ASSEMBLY__
  13#include <linux/threads.h>
  14
  15#include <asm/prefetch.h>
  16#include <asm/hardware.h>
  17#include <asm/pdc.h>
  18#include <asm/ptrace.h>
  19#include <asm/types.h>
  20#include <asm/percpu.h>
  21#endif /* __ASSEMBLY__ */
  22
  23/*
  24 * Default implementation of macro that returns current
  25 * instruction pointer ("program counter").
  26 */
  27#ifdef CONFIG_PA20
  28#define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  29#else /* mfia added in pa2.0 */
  30#define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  31#endif
  32#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  33
  34#define HAVE_ARCH_PICK_MMAP_LAYOUT
  35
  36#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  37#define TASK_SIZE               TASK_SIZE_OF(current)
  38#define TASK_UNMAPPED_BASE      (current->thread.map_base)
  39
  40#define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  41#define DEFAULT_MAP_BASE32      (0x40000000UL)
  42
  43#ifdef CONFIG_64BIT
  44#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  45#define DEFAULT_MAP_BASE        (0x200000000UL)
  46#else
  47#define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  48#define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  49#endif
  50
  51#ifdef __KERNEL__
  52
  53/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  54 * prumpf */
  55
  56#define STACK_TOP       TASK_SIZE
  57#define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  58
  59/* Allow bigger stacks for 64-bit processes */
  60#define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
  61                         ? (1 << 30)    /* 1 GB */                      \
  62                         : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
  63
  64#endif
  65
  66#ifndef __ASSEMBLY__
  67
  68/*
  69 * Data detected about CPUs at boot time which is the same for all CPU's.
  70 * HP boxes are SMP - ie identical processors.
  71 *
  72 * FIXME: some CPU rev info may be processor specific...
  73 */
  74struct system_cpuinfo_parisc {
  75        unsigned int    cpu_count;
  76        unsigned int    cpu_hz;
  77        unsigned int    hversion;
  78        unsigned int    sversion;
  79        enum cpu_type   cpu_type;
  80
  81        struct {
  82                struct pdc_model model;
  83                unsigned long versions;
  84                unsigned long cpuid;
  85                unsigned long capabilities;
  86                char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  87        } pdc;
  88
  89        const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  90        const char      *family_name;   /* e.g. "1.1e" */
  91};
  92
  93
  94/* Per CPU data structure - ie varies per CPU.  */
  95struct cpuinfo_parisc {
  96        unsigned long it_value;     /* Interval Timer at last timer Intr */
  97        unsigned long irq_count;    /* number of IRQ's since boot */
  98        unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  99        unsigned long hpa;          /* Host Physical address */
 100        unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 101#ifdef CONFIG_SMP
 102        unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 103#endif
 104        unsigned long bh_count;     /* number of times bh was invoked */
 105        unsigned long fp_rev;
 106        unsigned long fp_model;
 107        unsigned long cpu_num;      /* CPU number from PAT firmware */
 108        unsigned long cpu_loc;      /* CPU location from PAT firmware */
 109        unsigned int state;
 110        struct parisc_device *dev;
 111        unsigned long loops_per_jiffy;
 112};
 113
 114extern struct system_cpuinfo_parisc boot_cpu_data;
 115DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 116
 117#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 118
 119typedef struct {
 120        int seg;  
 121} mm_segment_t;
 122
 123#define ARCH_MIN_TASKALIGN      8
 124
 125struct thread_struct {
 126        struct pt_regs regs;
 127        unsigned long  task_size;
 128        unsigned long  map_base;
 129        unsigned long  flags;
 130}; 
 131
 132#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 133
 134/* Thread struct flags. */
 135#define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 136#define PARISC_UAC_SIGBUS       (1UL << 1)
 137#define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 138
 139#define PARISC_UAC_SHIFT        0
 140#define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 141
 142#define SET_UNALIGN_CTL(task,value)                                       \
 143        ({                                                                \
 144        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 145                                | (((value) << PARISC_UAC_SHIFT) &        \
 146                                   PARISC_UAC_MASK));                     \
 147        0;                                                                \
 148        })
 149
 150#define GET_UNALIGN_CTL(task,addr)                                        \
 151        ({                                                                \
 152        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 153                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 154        })
 155
 156#define INIT_THREAD { \
 157        .regs = {       .gr     = { 0, }, \
 158                        .fr     = { 0, }, \
 159                        .sr     = { 0, }, \
 160                        .iasq   = { 0, }, \
 161                        .iaoq   = { 0, }, \
 162                        .cr27   = 0, \
 163                }, \
 164        .task_size      = DEFAULT_TASK_SIZE, \
 165        .map_base       = DEFAULT_MAP_BASE, \
 166        .flags          = 0 \
 167        }
 168
 169struct task_struct;
 170void show_trace(struct task_struct *task, unsigned long *stack);
 171
 172/*
 173 * Start user thread in another space.
 174 *
 175 * Note that we set both the iaoq and r31 to the new pc. When
 176 * the kernel initially calls execve it will return through an
 177 * rfi path that will use the values in the iaoq. The execve
 178 * syscall path will return through the gateway page, and
 179 * that uses r31 to branch to.
 180 *
 181 * For ELF we clear r23, because the dynamic linker uses it to pass
 182 * the address of the finalizer function.
 183 *
 184 * We also initialize sr3 to an illegal value (illegal for our
 185 * implementation, not for the architecture).
 186 */
 187typedef unsigned int elf_caddr_t;
 188
 189/* The ELF abi wants things done a "wee bit" differently than
 190 * som does.  Supporting this behavior here avoids
 191 * having our own version of create_elf_tables.
 192 *
 193 * Oh, and yes, that is not a typo, we are really passing argc in r25
 194 * and argv in r24 (rather than r26 and r25).  This is because that's
 195 * where __libc_start_main wants them.
 196 *
 197 * Duplicated from dl-machine.h for the benefit of readers:
 198 *
 199 *  Our initial stack layout is rather different from everyone else's
 200 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 201 *  this:
 202
 203   -----------------------------------  (user startup code creates this frame)
 204   |         32 bytes of magic       |
 205   |---------------------------------|
 206   | 32 bytes argument/sp save area  |
 207   |---------------------------------| (bprm->p)
 208   |        ELF auxiliary info       |
 209   |         (up to 28 words)        |
 210   |---------------------------------|
 211   |               NULL              |
 212   |---------------------------------|
 213   |       Environment pointers      |
 214   |---------------------------------|
 215   |               NULL              |
 216   |---------------------------------|
 217   |        Argument pointers        |
 218   |---------------------------------| <- argv
 219   |          argc (1 word)          |
 220   |---------------------------------| <- bprm->exec (HACK!)
 221   |         N bytes of slack        |
 222   |---------------------------------|
 223   |    filename passed to execve    |
 224   |---------------------------------| (mm->env_end)
 225   |           env strings           |
 226   |---------------------------------| (mm->env_start, mm->arg_end)
 227   |           arg strings           |
 228   |---------------------------------|
 229   | additional faked arg strings if |
 230   | we're invoked via binfmt_script |
 231   |---------------------------------| (mm->arg_start)
 232   stack base is at TASK_SIZE - rlim_max.
 233
 234on downward growing arches, it looks like this:
 235   stack base at TASK_SIZE
 236   | filename passed to execve
 237   | env strings
 238   | arg strings
 239   | faked arg strings
 240   | slack
 241   | ELF
 242   | envps
 243   | argvs
 244   | argc
 245
 246 *  The pleasant part of this is that if we need to skip arguments we
 247 *  can just decrement argc and move argv, because the stack pointer
 248 *  is utterly unrelated to the location of the environment and
 249 *  argument vectors.
 250 *
 251 * Note that the S/390 people took the easy way out and hacked their
 252 * GCC to make the stack grow downwards.
 253 *
 254 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 255 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 256 * it in here from the current->personality
 257 */
 258
 259#ifdef CONFIG_64BIT
 260#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 261#else
 262#define USER_WIDE_MODE  0
 263#endif
 264
 265#define start_thread(regs, new_pc, new_sp) do {         \
 266        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 267        __u32 spaceid = (__u32)current->mm->context;    \
 268        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 269        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 270                                                        \
 271        regs->iasq[0] = spaceid;                        \
 272        regs->iasq[1] = spaceid;                        \
 273        regs->iaoq[0] = pc;                             \
 274        regs->iaoq[1] = pc + 4;                         \
 275        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 276        regs->sr[3] = 0xffff;                           \
 277        regs->sr[4] = spaceid;                          \
 278        regs->sr[5] = spaceid;                          \
 279        regs->sr[6] = spaceid;                          \
 280        regs->sr[7] = spaceid;                          \
 281        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 282        regs->fr[ 0] = 0LL;                             \
 283        regs->fr[ 1] = 0LL;                             \
 284        regs->fr[ 2] = 0LL;                             \
 285        regs->fr[ 3] = 0LL;                             \
 286        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 287        regs->gr[31] = pc;                              \
 288                                                        \
 289        get_user(regs->gr[25], (argv - 1));             \
 290        regs->gr[24] = (long) argv;                     \
 291        regs->gr[23] = 0;                               \
 292} while(0)
 293
 294struct task_struct;
 295struct mm_struct;
 296
 297/* Free all resources held by a thread. */
 298extern void release_thread(struct task_struct *);
 299
 300extern unsigned long get_wchan(struct task_struct *p);
 301
 302#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 303#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 304
 305#define cpu_relax()     barrier()
 306
 307/*
 308 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 309 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 310 * with different data, whether clean or not) to operate
 311 */
 312#ifdef CONFIG_PA8X00
 313extern int _parisc_requires_coherency;
 314#define parisc_requires_coherency()     _parisc_requires_coherency
 315#else
 316#define parisc_requires_coherency()     (0)
 317#endif
 318
 319#endif /* __ASSEMBLY__ */
 320
 321#endif /* __ASM_PARISC_PROCESSOR_H */
 322